Thanks Paul, that's great, however, it makes the content sit in the middle of the banner, but slightly off center vertically, and now adjusting the line-height of the h1, even to the extremes doesn't seem to budge the text :S

The element is placed absolutely then you can set the line height to the height of that blue strip and it will be vertically centred. Just increase the line height up or down a pixel to move it as required.